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1. (WO1989009075) HYPODERMIC NEEDLE RETRACTOR

Pub. No.:    WO/1989/009075    International Application No.:    PCT/AU1989/000121
Publication Date: Oct 5, 1989 International Filing Date: Mar 21, 1989
IPC: A61M 5/32
A61M 5/50
Applicants: DAVSA SEVENTY-FIFTH PTY. LTD.
KITE, John, Patrick
Inventors: KITE, John, Patrick
Title: HYPODERMIC NEEDLE RETRACTOR
Abstract:
A hypodermic syringe (10) has a retractable needle (18) carried in a needle support (17) mounted on the end of the syringe body (11). The needle (18) is attached to a needle holder (22) which has a conical head (26) on its forward end. A passage (30) in the holder enables the needle bore to communicate through holes (29) in the holder (22) with the chamber (14). The plunger and piston assembly (32) has a piston (33) with a sealing cap (35) engaged therewith. The piston (33) has a forwardly extending tubular portion (39) defining an opening with a tapered wall (40) which engages over the head (26) to lock the head behind an abutment surface (41). At the same time a diaphragm (38) formed by the sealing cap (35) extending across the tubular portion (39) is ruptured so the chamber (14) is no longer sealingly enclosed.